Date: Simplify math
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@ -3018,8 +3018,8 @@ convert_time() {
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# Calculate day of week.
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# Source: http://blog.artofmemory.com/how-to-calculate-the-day-of-the-week-4203.html
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year_code="$((${year/??} + $((${year/??} / 4)) % 7))"
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week_day="$(($((year_code + month_code + 6 + day - ${leap_code:-0})) % 7))"
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year_code="$((${year/??} + (${year/??} / 4) % 7))"
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week_day="$(((year_code + month_code + 6 + day - leap_code) % 7))"
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case "$week_day" in
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0) week_day="Sun" ;;
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